Snowball Earth hypothesis challenged

The hypothesis that the Earth was completely covered in ice 635 million years ago has received a serious blow. The atmospheric concentration of CO2 during that period was much lower than previously thought, according to a team of French researchers from the Institut de Physique du Globe de Paris (CNRS, France), working in collaboration with scientists from Brazil and the US. Their work, which is published in the journal Nature on October 6, challenges part of the so-called Snowball Earth hypothesis and rekindles the debate about the origins of the deglaciation mechanism.

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